<html>
    <head>
        <title>学习网页制作</title>
        <!-- <link href="style.css" rel="stylesheet" type="text/css"/> -->
        <style type="text/css">
        <!--
        @import url("style.css");
        -->
        </style>
    </head>
    <body>
        <p>标签选择器</p>
        <p class="second">类选择器</p>
        <p id="third">ID选择器</p>
    </body>
</html>